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science unit 3b (8th grade) > unit 3 > Flashcards

unit 3 Flashcards

1
Q

When a person rubs their hands together it causes stored chemical energy to be transformed into mechanical energy. Due to the Law of Conservation of Energy some of the energy is also transformed into _______ energy.

A

thermal

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2
Q

what form of energy is lightning?

A

electrical

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3
Q

explain the energy transformation that takes place when a hairdryer is being used.

A

electric to mechanical

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4
Q

describe the energy transformation that occurs as you use a bow and arrow.

A

(elastic)potential to kinetic. potential is in the bow stored as elastic potential which transfers as you release the arrow to kinetic energy.

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5
Q

whats an example of kinetic energy?

A

a person running, a ball falling from a shelf.

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6
Q

what type of energy is used to move a bicycle?

A

mechanical

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7
Q

a rollercoaster stopped at the top of a hill illustrates what type of energy?

A

potential

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8
Q

what type of energy is used to turn on a light switch?

A

mechanical

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9
Q

give an example of an object increasing its potential energy.

A

potential energy increases because of position of mass. pulling further back on a rubber band would increase the potential energy.

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10
Q

light is an example of what type of energy?

A

radiant

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11
Q

what does the law of conservation state?

A

energy can be neither created nor destroyed. It can be transformed, but the total amount of energy is always the same.

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12
Q

what type of energy transformation is solar panels charging a battery?

A

radiant to chemical

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13
Q

give an example of electrical energy being converted to mechanical energy.

A

ceiling fan- the electrical switch is turned on and blades move

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14
Q

what type of energy conversion occurs when logs burn in the campfire?

A

chemical to radiant and thermal

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15
Q

why are chemical, nuclear, gravitational and elastic energies forms of potential energy?

A

because of energy in all of these forms is “stored” until it is used by transforming in another type.

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16
Q

what is “energy in motion” called?

A

kinetic

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17
Q

what is “stored energy” called?

A

potential energy

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18
Q

A baseball player hits a fly ball. describe the energy conversion that occurs as the ball falls from a highest point.

A

at the highest point, the energy is all potential. The potential convert to kinetic as the ball falls before it touches the ground it becomes all kinetic , when it stops, it is potential again.

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19
Q

digesting food performs what type of energy transformation?

A

chemical to mechanical

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20
Q

in your own words, describe convection.

A

convection is heat transfer influences. This can be liquids or gases. The warmer particles rise, the cooler ones sink. The process continues to form a current.

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21
Q

Colton got burned by touching a lighter he was using to start a campfire. how was the heat energy transferred from the letter to his hand?

A

conduction

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22
Q

you get a sunburn after to be on the beach over fall break. what type of energy transfer is this?

A

radiation

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23
Q

which term refers to the transfer of heat my electromagnetic waves?

A

radiation

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24
Q

which term refers to the transfer of heat by direct contact?

A

conduction

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25
Q

which term refers to the transfer of heat by the movement of a fluid?

A

convection

26
Q

heat always moves from ___________.

A

warmer to cooler

27
Q

a lizard basking in the morning sun is an example of:

A

radiation

28
Q

heating food up in the microwave is an example of:

A

radiation

29
Q

cooking pancake, using a stove top burner is an example of:

A

conduction

30
Q

blood circulation in warmer blooded animals is an example of:

A

convection

31
Q

A hot air balloon rising is an example of:

A

convection

32
Q

Ironing your clothes is an example of:

A

conduction

33
Q

heat and temperature are the same thing?
true or false?

A

false

34
Q

all matter contains heat energy.
true or false?

A

true

35
Q

Energy is the ability to do _____ or cause ________

A

work, change

36
Q

Energy exist in many forms and can be ______________ from one form to another.

A

transformed

37
Q

__________ energy is stored energy based on an objects _________ or ___________.

A

Potential
position, condition

38
Q

The higher the ________ or the greater the ______ , the more potential energy an object has.

A

height
mass

39
Q

_________ energy is the energy of _________.

A

Kinetic
motion

40
Q

the faster an object moves or the more ______ it has, the greater its kinetic energy.

A

mass

41
Q

a ball at the top of a hill has ___________ energy.

A

potential

42
Q

a ball rolling down a hill has _______ energy.

A

kinetic

43
Q

he is transferred through direct ________ between objects.

A

contact

44
Q

A metal spool getting hot in a cup of soup is an example of:

A

conduction

45
Q

he is transferred by the movement of _______ or ______.

A

liquids
gases

46
Q

boiling water in a pot is an example of:

A

convection

47
Q

heat is transferred through ________ waves and does not require a medium.

A

electromagnetic

48
Q

the sun warming the earth is an example of:

A

radiation

49
Q

________ energy is stored in bonds and released during chemical reactions.

A

chemical

50
Q

_______ powers a car as an example of chemical energy.

A

Gasoline

51
Q

__________ energy comes from the movement of charged particles.

A

Electrical

52
Q

a lamp plugged into an outlet is an example of what energy?

A

electrical.

53
Q

________ energy comes from the movent of particles within a substance.

A

thermal

54
Q

a pot heating on a stove is an example of what energy?

A

thermal

55
Q

________ energy travels in waves and can move through space.

A

radiant(light)

56
Q

__________ energy is the sum of kinetic energy and potential energy in a system.

A

mechanical

57
Q

a lamp transfers _______ energy into _____ and _______ energy.

A

electrical
light, thermal

58
Q

photosynthesis transfers ________ energy into ______ energy in plants.

A

light
chemical

59
Q

a rollercoaster transfers _________ energy into _______ energy as it moves.

A

potential
kinetic energy

60
Q

When chocolate melts in the sun he is transferred by __________.

A

radiation

science unit 3b (8th grade) (3 decks)

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